It may have been checked off President Obama’s to-do list, but the Iraq war is far from over. Sunday saw suspected Sunni insurgents stage the single deadliest day of bombings since U.S. troops withdrew last December, coinciding with an Iraqi court delivering a death sentence in absentia to the country’s most senior Sunni politician, Vice President Tareq al-Hashemi. Those events, read alongside last week’s reports of the U.S. complaining that Iraq is allowing Iran to use its airspace to resupply the forces of President Bashar al-Assad in neighboring Syria, suggest that Iraq remains one of the hotter theaters of the regional Cold War between Iran and Saudi Arabia.

More than 100 Iraqis were killed in the bombings that struck most of the country’s major cities. The attacks are believed to be the work of Sunni insurgents whose fortunes have been boosted by a combination of their community’s alienation from the Shi’ite-dominated political order, and the civil war in next door Syria, which pits kindred rebel fighters backed by key regional players such as Saudi Arabia and Turkey against the Iran-backed Assad regime. Hashemi, meanwhile, was sentenced to hang on charges of leading a death squad responsible for the killing of a number of Shi’ite political figures. The Vice President, who fled an attempt to arrest him the day after U.S. forces left, strongly rejected the verdict in a statement from Turkey, deeming it little more than a sectarian political gambit by his arch-enemy, Prime Minister Nouri al-Maliki. Whatever the merits of the case, the verdict has deepened the sectarian tension that the political system looks increasingly incapable of resolving.

The 2003 U.S. invasion of Iraq delivered a tectonic shock to the sectarian balance of power of the entire Middle East. Since 1979, the main indigenous fault line had been the strategic rivalry between Saudi Arabia and allied Sunni autocracies, and the revolutionary Shi’ite regime of Iran. Saddam Hussein, who launched an eight-year, Saudi-backed war in which Iran lost as many as 1 million of its citizens, was Iran’s most reviled enemy. His ouster by the Americans created space for Iraq’s Shi’ites to press the Bush Administration to reluctantly accept that the Iranians would democratically choose their own government as early as 2005. Once it went to the vote, the Shi’ites’ demographic advantage took care of the rest. In one of the great strategic ironies of the 21st Century, a full-blown U.S. ground invasion mounted at massive cost to Washington produced a regime closer to Iran than it is to the U.S.

The Sunni minority, stripped of the relative privilege it had enjoyed under Saddam, produced an insurgency that was ultimately contained and defeated by a combination of two factors: the effective ethnic cleansing of cities and neighborhoods in which the communities lived cheek by jowl, largely at the expense of the Sunnis, and the U.S. cultivation of the Anbar Awakening movement, which involved putting many thousands of Sunni insurgents on the American payroll to turn them against the local al-Qaeda chapter. The U.S. expected Maliki to integrate Awakening groups into the national security forces, but he viewed them as a potential threat and turned on them, cutting off their funding and arresting many of their leaders.

Hopes of integrating the Sunnis into the new order by giving them a representative stake in the political system also suffered a major blow when, despite winning the largest share of the vote, the predominantly Sunni Iraqiyya bloc was outmaneuvered by Maliki, who appealed to Shi’ite unity to forge a deal with rival parties to reclaim the top spot. Even then, in order to get the new parliament seated, Maliki needed a deal with Iraqiyya, which was eventually hammered out in Erbil, capital of the autonomous Kurdish region, and envisaged Maliki handing key portfolios to Iraqiyya bloc. Maliki failed to deliver, instead consolidating his personal control over the security forces. Indeed, Sunni and Kurdish complaints of Maliki assuming “dictatorial” powers and preparing to hold onto power when Iraqis vote for a new parliament in 2014 have been echoed even by Moqtada al-Sadr, the firebrand Shi’ite cleric on whose support the Prime Minister depends for a parliamentary majority.

Still, despite the alienation of the Sunnis from the post-Saddam order, sectarian violence today remains confined largely to terror attacks, with full-blown territorial warfare unlikely, notes Douglas A. Ollivant of the Council on Foreign Relations, because Shi’ites and Sunnis “are no longer significantly intermingled in population centers, making it difficult for one to attack the other.” Shi’ite communities no longer respond primarily through sectarian militia retaliation, perhaps because of their dominance in the state security apparatuses. The state is relentlessly pursuing suspected insurgents, with 96 men hanged this year alone, mostly on treason and terrorism convictions.

Terror attacks have remained a constant in Iraq, but they don’t represent an existential challenge to the Maliki regime. More dangerous to him, perhaps, are efforts to use Iraq’s institutions to oust him, via a motion of no-confidence in the legislature, courting not only Sunni and Sadrist support, but also the Kurds. Baghdad and Erbil have been at loggerheads for months over oil revenues and contracts signed by the crypto-secessionist Kurdish Regional Government, and Kurdish leaders appear to have made common cause with the challenge to Maliki. Efforts to oust him through the political institutions are likely to see an escalation of his authoritarian efforts to consolidate power.

Tony Karon is a senior editor at TIME, where he has covered international conflicts in the Middle East, Asia, and the Balkans since 1997. A native of South Africa, he now resides with his family in Brooklyn, New York.

Nobody monitors the desert king; deposits and withdrawals are made from his secret vaults. He often loads up duffel bags full of hundred dollar bills and then has a prince drop it off on an obedient politician’s desk. Visiting heads of state bow down to suck and smell the unwashed fingers of the king, all for a duffel bag full of cash.

iraq hangs terrorists ???? you report 97 people hanged as if you were discussing one of your many football tweets....

tell us tony baloney: what do you think the response would be if israel hanged terrorists ???

once again, tony baloney, you clearly demonstrate that deep down in your heart you don't consider arabs to be human beings....97 arabs hanged, manchester united lost 3 goals to 2, it's all the same....

This should come as no surprise. Ever since the war between Iran and Iraq under Saddam Hussain, Iran has been waiting to get even. With a Shia majority in Iraq ruling the country and events in Syria providing a perfect opportunity to enlarge this into a shia/sunni battle, the game plan is clear. The entire region will see turmoil and the west will have to be content watching from the sidelines! If the savagery in Syria is awful, wait for other parts to erupt. It is no coincidence that countries with sizable Shia populations are all clamoring for more power. We saw this in Bahrain and now in Southern Saudi Arabia. Iran sees itself as the leader of the shias and will counter Saudi Arabia, the recognized leader of the sunnis. The world will see the oil world ignite, with or without nuclear power!